Why do my objects disappear from certain angles when played in the BGE
I'm not entirely sure why this is happening.

However, I found that joining the arm mesh to the rest of the character mesh (with &#9096; CtrlJ) (and joining the two armatures, also with &#9096; CtrlJ) fixed it.



My first thought is that the BGE's view frustum culling was hiding the arm, but if that's the case, I'm not sure why it doesn't also hide the entire character..